. Carnegie Institution of Washington publication. 126 THE CACTACEAE. Series 7. TORTISPINAE. Prostrate or spreading plants rarely erect, with mostly rather small, persistent, scarcely tuber- culate, orbicular or oval joints, and large flowers; natives of the eastern, central, and southern United States. Plate 21 represents a group of hardy cacti, chiefly species of this series, at the New York Botanical Garden. KEY TO SPECIES. Spines none or only i or 2 at an areole. Joints bluish green; at least when young; roots tuber-like. Fruit clavate; joints thin. Fruit about cm. long. . 116. 0. allai
. Carnegie Institution of Washington publication. 126 THE CACTACEAE. Series 7. TORTISPINAE. Prostrate or spreading plants rarely erect, with mostly rather small, persistent, scarcely tuber- culate, orbicular or oval joints, and large flowers; natives of the eastern, central, and southern United States. Plate 21 represents a group of hardy cacti, chiefly species of this series, at the New York Botanical Garden. KEY TO SPECIES. Spines none or only i or 2 at an areole. Joints bluish green; at least when young; roots tuber-like. Fruit clavate; joints thin. Fruit about cm. long. . 116. 0. allairci Fruit 5 to 7 cm. long ... n6a. O. lata Fruit obovoid; joints 117. 0. pollardii Joints green; roots not tuberous. Flowers 8 cm. broad or less. Joints orbicular or little longer than wide . 118. 0. apniilia Joints oblong, much longer than wide ... 119. 0. macmrthra Flowers 10 to 12 cm. broad Spines mostly 2 or more at an areole. Ovary obconic, 2 to 4 cm. long. Roots tuberous. Joints repand; plant suberect .121. Joints scarcely icpand; plants nearly prostrate. .122. Roots not tuberous. Flowers and fruit small . 123. 0. plitmbea Flowers and fruit large. Spines white to light brown, slender. Seeds acute-margined . 124. O. tortispina Seeds obtuse-margined. Fruit large, 4 to 5 cm. long; spines light 125. 0. stenochila 120. O. grand i'flora O. aiistrina 0. macrorhiza Fruit small, 2 to 3 cm. long; spines brown 126. O. delicata. Spines dark brown, stout. .127. Ovary narrowly subcylindric, 5 to 6 cm. 1270. : 83. 1909. O. fiiscoalra 0. macalcei FIG. 158.— Opuntia allairei. 116. Opuntia allairei Griffiths, Rep. Mo. Bot. Card. 20 A low, spreading, tuberous-rooted, prostrate plant, with some of the joints ascending; joints bluish green, obovate, usually 10 to 15 cm. long, originally described as even longer, with or without spines; spines, if present, i to 3, yellowish brown, cm. long or less, slender but a little flattened; glochids numerous, espe
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